The wavelength range of the visible spectrum extends from violet (400 nm) to red (750 nm). Express these wavelengths in frequencies(Hz), `(1nm=10^(-9)m)`.

Explanation

Frequency of violet light `V=c/lambda=(3.00xx10^8ms^(-1))/(400xx10^(-9))=7.50xx10^14Hz` Frequency of red light `lambda=c/lambda=(3.00xx10^8ms^(-1))/(750xx10^(-9))=4.0xx10^14Hz` The range of visible spectrum is from `4.0xx10^14` to `7.5xx10^14` Hz.in terms of frequency units.